package com.example.app.entity

//class User {
//class User   constructor() {
//class User    constructor( var username:String?, var  password:String?, var  code:String?)  {
//data calss 数据类
data class User    constructor( var username:String?, var  password:String?, var  code:String?)  {
/*      var username:String?=null;
      var password:String?=null;
      var code:String?=null;
    constructor()
    constructor( username:String,   password:String,   code:String){
        this.username = username;
        this.password = password;
        this.code = code;
    }*/

/*    var username:String?=null;
    var password:String?=null;
    var code:String?=null;*/

//    constructor( username:String,   password:String,   code:String):this() {
//        this.username = username;
//        this.password = password;
//        this.code = code;
//    }

    constructor():this(null,null,null)

}
